# O vs 金牛金牌服务

The clearest difference is update cadence: O at every 2 weeks against 金牛金牌服务's monthly. 金牛金牌服务's advantage is iOS requirement (11.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

O ships an update every 2 weeks, 金牛金牌服务 monthly. The most recent releases landed on October 2, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | O | 金牛金牌服务 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/o-trial-pro/id1658238794/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free | — |
| Size | 56 MB | 35 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [铨融 (苏州)医药科技开发有限公司](https://appshunter.io/developer/1253822764) | [伟 秦](https://appshunter.io/developer/1682821769) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-trial-pro/id1658238794)

This app provides an information management solution for clinical trials. It aims to streamline trial processes and data handling for medical professionals. The application is designed for use on iPhones and iPods.

**Highlights:** Clinical trial information management, Streamlined trial processes, Data handling for medical professionals, Mobile solution for iPhone and iPod

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### 金牛金牌服务

[App page](https://appshunter.io/ios/app/id6447818435)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

O is free to download, with no in-app purchases.

### Is 金牛金牌服务 free?

金牛金牌服务 is free to download, with no in-app purchases.

### Do O or 金牛金牌服务 have ads?

Neither O nor 金牛金牌服务 shows ads.

### Which is updated more often, O or 金牛金牌服务?

O ships an update every 2 weeks, and 金牛金牌服务 monthly. Most recently, O was updated on October 2, 2026 and 金牛金牌服务 on October 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*